Whitehead, J. F., Büttner, J. C., Klepp, S. E., Grubb, F. W., & De Ortiz, A. P. (2006). Souls for sale: Two German redemptioners come to revolutionary America : the life stories of John Frederick Whitehead and Johann Carl Büttner. University Park, Pa.: Pennsylvania State University Press.

Whitehead, John Frederick, Johann Carl Büttner, Susan E. Klepp, Farley Ward Grubb, and Anne Pfaelzer De Ortiz. Souls for Sale: Two German Redemptioners Come to Revolutionary America : The Life Stories of John Frederick Whitehead and Johann Carl Büttner. University Park, Pa.: Pennsylvania State University Press, 2006.

Whitehead, John Frederick, et al. Souls for Sale: Two German Redemptioners Come to Revolutionary America : The Life Stories of John Frederick Whitehead and Johann Carl Büttner. University Park, Pa.: Pennsylvania State University Press, 2006.